Air curtain device and extractor hood

Abstract

The application relates to the kitchen household appliance field, and provides a wind curtain device and an oil extractor hood. The oil extractor hood comprises a box body and a wind curtain device arranged in the box body. The box body is provided with a first cavity and a second cavity located above the first cavity. The wind curtain device comprises a wind curtain air duct arranged in the second cavity and provided with a first air outlet. The first air outlet is used for communicating with an external space of the oil extractor hood and is used for directing towards a smoke suction hole of the first cavity. An end portion of the wind curtain air duct provided with the first air outlet is flush with or located above an outer surface of a lower wall of the second cavity. Therefore, the oil fume rising and about to leak can be timely carried to the smoke suction hole by the wind curtain airflow and then sucked away by the oil extractor hood, so that the oil fume escape is relieved, and the smoke suction effect is improved. Meanwhile, the wind curtain air duct can be hidden in the second cavity while assisting in smoke suction, and the appearance of the oil extractor hood is improved.

Description

Technical Field

[0001] This application relates to the field of kitchen appliances, and in particular to an air curtain device and a range hood. Background Technology

[0002] Currently, the main smoke inlet of most side-draft range hoods is located on the side of the hood, and its smoke collection plate is parallel to or at a certain angle to the wall where it is installed. This reduces the distance between the main smoke inlet and the pot, giving side-draft range hoods the advantages of larger smoke volume and faster smoke extraction compared to top-draft range hoods.

[0003] However, when a range hood is used in an environment with heavy cooking fumes and high duct resistance, some of the fumes cannot be sucked away by the smoke inlet in time. Instead, they quickly rise to the edge of the range hood, causing air pollution. Some range hoods now use air curtain devices to project airflow, drawing fumes into the smoke inlet and mitigating their escape. However, aesthetics and smoke extraction efficiency cannot be simultaneously achieved. Summary of the Invention

[0004] This application provides an air curtain device and a range hood that can carry rising and leaking fumes to the smoke inlet so that they can be sucked away and discharged by the range hood, while concealing the air curtain duct into the cavity to improve the aesthetics of the range hood.

[0005] To address the aforementioned technical problems, this application provides an air curtain device for a range hood. The range hood includes a housing and an air curtain device disposed within the housing. The housing has a first cavity and a second cavity located above the first cavity. The air curtain device includes an air curtain duct disposed within the second cavity and has a first air outlet. The first air outlet communicates with the external space of the range hood and faces the smoke extraction hole of the first cavity. The end of the air curtain duct with the first air outlet is flush with or above the lower outer surface of the second cavity.

[0006] In some embodiments, at least a portion of the outer surface of the lower wall is located between the first air outlet and the smoke extraction hole in the horizontal direction, and the tangential direction of the inner wall surface of the first air outlet is set at an acute angle to the inner and outer surfaces of the lower wall.

[0007] In some embodiments, the inner wall surface of the first air outlet includes a first wall portion and a second wall portion, wherein the first wall portion is closer to the smoke inlet than the second wall portion; the first angle between the first tangent of the first wall portion facing outward at the first air outlet and the at least partial area is 0-45°, and the second angle between the second tangent of the second wall portion facing outward at the first air outlet and the at least partial area is 0-70°.

[0008] In some embodiments, the angle between the first tangent and the second tangent is 0-20°.

[0009] In some embodiments, the air curtain duct further includes: an upper cover plate disposed on the side of the air curtain duct away from the smoke inlet, and a second wall portion disposed on the upper cover plate; a lower cover plate disposed on the side of the air curtain duct close to the smoke inlet, and a first wall portion disposed on the lower cover plate; the upper cover plate and the lower cover plate enclose an airflow cavity forming the air curtain duct, and the airflow cavity communicates with the first air outlet.

[0010] In some embodiments, the end of the first air outlet is located in the horizontal plane.

[0011] In some embodiments, the air curtain duct includes a first air inlet, which is arranged horizontally along its axis.

[0012] In some embodiments, the air curtain duct includes an air inlet section, a first air guide section, and a second air guide section connected in sequence. The air inlet section has a first air inlet at one end away from the first air guide section. The air inlet section is used to guide the airflow flowing in from the first air inlet in a horizontal direction to the first air guide section. The first air guide section is used to guide the airflow in the air inlet section to turn from a horizontal direction to a vertical downward direction. The second air guide section has a first air outlet at one end away from the first air guide section. The second air guide section is used to guide the vertically downward airflow in the first air guide section to turn towards the smoke inlet.

[0013] In some embodiments, the air curtain duct includes a first air inlet, which is vertically oriented axially.

[0014] In some embodiments, the air curtain device further includes: an air curtain fan, including a second air inlet and a second air outlet, wherein the second air inlet is connected to the external space of the range hood; and the first air inlet is connected to the second air outlet.

[0015] In some embodiments, the air curtain duct further includes: at least one support portion disposed at the first air outlet and vertically connected to the upper cover plate and the lower cover plate.

[0016] To solve the above-mentioned technical problems, this application also provides a range hood, including: a housing, including a first cavity and a second cavity located above the first cavity, wherein the smoke extraction hole of the range hood is disposed in the first cavity; an air curtain device as described in any of the above claims; wherein the end of the air curtain duct with the first air outlet is flush with or located above the lower outer surface of the second cavity.

[0017] In some embodiments, the air curtain device further includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located in the second cavity. The air curtain duct includes a first air inlet, which is horizontally arranged axially. The first air inlet is connected to the second air outlet. The second cavity further includes a first sub-sidewall, which is provided with a first air inlet hole, which is arranged opposite to the second air inlet.

[0018] In some embodiments, the air curtain device further includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located in the second cavity. The air curtain duct includes a first air inlet, which is horizontally arranged axially. The first air inlet is connected to the second air outlet. The second cavity also includes an upper wall, which is provided with a second air inlet hole, which is arranged opposite to the second air inlet.

[0019] In some embodiments, the air curtain device further includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located outside the housing. The air curtain duct includes a first air inlet, which is vertically arranged axially. The first air inlet is connected to the second air outlet.

[0020] In some embodiments, the range hood further includes: a condenser plate disposed outside the front end of the first cavity and covering the smoke inlet; the condenser plate is provided with an upper smoke inlet at one end near the second cavity, and the first air outlet is directed toward the upper smoke inlet.

[0021] In some embodiments, the projected area of ​​the smoking hole in the horizontal plane is greater than or equal to 1 / 4 of the projected area of ​​the first cavity in the horizontal plane.

[0022] This application provides an air curtain device and a range hood. The range hood includes a housing and an air curtain device disposed within the housing. The housing has a first cavity and a second cavity located above the first cavity. The air curtain device includes an air curtain duct disposed within the second cavity and has a first air outlet. The first air outlet communicates with the external space of the range hood and faces the smoke inlet of the first cavity. The end of the air curtain duct with the first air outlet is flush with or above the lower outer surface of the second cavity. This allows rising fumes to be promptly carried by the air curtain airflow to the smoke inlet and then sucked away and discharged by the range hood, thereby reducing fume escape and improving smoke extraction efficiency. Simultaneously, the air curtain duct can be concealed within the second cavity while assisting in smoke extraction, improving the aesthetics of the range hood. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a range hood provided in some embodiments of this application;

[0025] Figure 2 An exploded structural diagram of the range hood provided in Embodiment 1 of this application;

[0026] Figure 3 This is a side sectional view of a range hood provided in some embodiments of this application;

[0027] Figure 4 Schematic diagrams of the air curtain device provided for some embodiments of this application;

[0028] Figure 5 A side cross-sectional view of an air curtain duct provided for some embodiments of this application;

[0029] Figure 6 A bottom view of a single-sided air curtain duct provided for some embodiments of this application;

[0030] Figure 7 This is a cross-sectional schematic diagram of a portion of the structure of a range hood provided in Embodiment 1 of this application;

[0031] Figure 8 This is a schematic diagram of the structure of a condenser plate provided in some embodiments of this application;

[0032] Figure 9 This is a three-dimensional structural diagram of the range hood provided in Embodiment 2 of this application;

[0033] Figure 10 This is a partial structural diagram of the range hood provided in Embodiment 2 of this application;

[0034] Figure 11 A three-dimensional structural diagram of a portion of the range hood provided in Embodiment 3 of this application;

[0035] Figure 12 This is a cross-sectional structural view of a range hood component provided in Embodiment 3 of this application;

[0036] Figure 13 A front view schematic diagram of a single-sided air curtain duct provided in Embodiment 3 of this application;

[0037] Figure 14 A side cross-sectional view of the air curtain duct provided in Embodiment 3 of this application;

[0038] Figure 15 Simulation of the airflow emitted by the air curtain device when the first included angle is fixed at 60° and the second included angle is set to different angles in some embodiments of this application;

[0039] Figure 16 Simulation of the airflow emitted by the air curtain device when the second included angle is fixed at 60° and the first included angle is set to different angles for some embodiments of the present application;

[0040] Figure 17 This paper presents a simulation of the airflow emitted by the air curtain device when the first included angle is fixed at 30° and the second included angle is set to different angles in some embodiments of the present application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] The terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, all directional indicators (such as up, down, left, right, front, back, top, bottom, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0045] Unless otherwise defined, the term “approximately” as used in this application can be understood, in relation to numerical quantities or quantitative relationships, as a range of approximately ±15% of a given value.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] The directions and orientations specified in this application are based on the range hood in its usage state after installation.

[0048] Implementation Method 1:

[0049] To solve the above-mentioned technical problems, this application provides a range hood. See also... Figures 1-2 , Figure 1 This is a schematic diagram of the structure of a range hood provided in some embodiments of this application; Figure 2 This is a schematic diagram of the exploded structure of a range hood provided in Embodiment 1 of this application.

[0050] The range hood 100 includes a housing 110 and a smoke exhaust chamber 120. The housing 110 includes a smoke collection plate 111 with smoke extraction holes 1111. The housing 110 also includes a first cavity 112 and a second cavity 113 disposed above the first cavity 112. The smoke collection plate 111 and the smoke extraction holes 1111 are located in the first cavity 112. The smoke exhaust chamber 120 communicates with the housing 110, and the horizontal width of the smoke exhaust chamber 120 is less than the horizontal width of the housing 110.

[0051] The phrase "the second cavity 113 is located above the first cavity 112" means that, in the vertical direction, the second cavity 113 is located above the first cavity 112, without specifying whether the second cavity 113 is directly above the first cavity 112.

[0052] In this embodiment, the second cavity 113 is disposed diagonally above the first cavity 112 so that the first cavity 112 can communicate with the exhaust cavity 120 directly above it for exhaust; in the horizontal direction, the second cavity 113 is disposed near the front end of the range hood 100 relative to the first cavity 112.

[0053] The range hood 100 is fixedly installed on the wall via the exhaust chamber 120. In some embodiments, the range hood 100 can also be installed with the housing 110 positioned as low as possible, so that the smoke inlet 1111 is located closer to the cooking countertop to improve smoke extraction efficiency. A main fan 121 is installed in the exhaust chamber 120, thereby generating negative pressure within the range hood 100 through the main fan 121, and drawing in cooking fumes through the smoke inlet 1111.

[0054] In some embodiments, in order to increase the air intake area, reduce the air intake resistance, and improve the smoke extraction effect, the projected area of ​​the smoke extraction hole 1111 in the horizontal plane is set to be greater than or equal to 1 / 4 of the projected area of ​​the first cavity 112 in the horizontal plane.

[0055] In some embodiments, in order to improve the strength of the housing 110, reduce the deformation and vibration of the housing 110, and also to improve the smoking capacity of the smoking hole 1111, the smoking hole 1111 is recessed into the interior of the first cavity 112.

[0056] In some embodiments, the range hood 100 is provided with an oil filter 1112 at the smoke inlet 1111, which can prevent large foreign objects from being sucked into the fan, and at the same time allow oil to condense, thereby intercepting oil and reducing the pollution of the inner cavity of the range hood 100 by oil.

[0057] See Figures 2-3 , Figure 3This is a side cross-sectional view of a range hood provided in some embodiments of this application. The exhaust chamber 120 further includes: a first back plate 122, a frame 123, and a front cover 124. When the range hood 100 is fixedly installed on a wall, the first back plate 122 is disposed close to the wall, and the main fan 121 is disposed on the frame 123. The main air inlet 1211 of the main fan 121 faces the first back plate 122, and there is a certain distance between the main air inlet 1211 and the first back plate 122 to form an air inlet duct 1213. In some embodiments, the distance between the main air inlet 1211 and the first back plate 122 is not less than 80mm, such as 80mm, 85mm, 90mm, 95mm, etc., so that the resistance to gas flow between the main air inlet 1211 and the smoke hole 1111 is smaller, the path is shorter, and the smoke extraction capacity of the range hood 100 is stronger. Furthermore, the main air inlet 1211 of the main fan 121 faces the first back panel 122, so that the air inlet duct 1213 of the main fan 121 is located on the rear side (closer to the wall) of the exhaust chamber 120, thereby allowing the oil fume airflow to be drawn in from the rear side of the range hood, reducing the possibility of oil fume escaping forward.

[0058] See also Figure 2 The first cavity 112 is provided with a second back plate 1121, and the second cavity 113 includes an upper wall 1131 and a lower wall 1132. When the range hood 100 is fixedly installed on the wall, the second back plate 1121 is located close to the wall, and the upper wall 1131 is located on the side of the housing 110 near the exhaust cavity 120. In some embodiments, the housing 110 and the exhaust cavity 120 are fixedly connected by a flange 1133 on the upper wall 1131. The lower wall 1132 is located on the side of the housing 110 away from the exhaust cavity 120, and the lower wall 1132 is connected to the smoke collection plate 111. The range hood 100 further includes an air curtain device 115, which is disposed within the second cavity 113 formed by the upper wall 1131 and the lower wall 1132.

[0059] See Figure 4 , Figure 4This is a schematic diagram of the structure of an air curtain device provided in some embodiments of this application. The air curtain device 115 includes an air curtain fan 1151 and an air curtain duct 1152. The air curtain fan 1151 includes a second air inlet 11511 and a second air outlet 11512. The air curtain duct 1152 includes a first air inlet 11521 and a first air outlet 11522. The second air inlet 11511 and the first air outlet 11522 are respectively connected to the external space of the range hood 100. The second air outlet 11512 is connected to and directly connected to the first air inlet 11521. The first air outlet 11522 is directed toward the smoke hole 1111 of the first cavity 112, that is, the direction of the air curtain airflow blown out from the first air outlet 11522 is toward the smoke hole 1111. This allows rising and escaping fumes to be carried by the airflow from the air curtain device 115 to the smoke inlet 1111, where they are then sucked away by the range hood 100, thus preventing some fume leakage and improving smoke extraction efficiency. Furthermore, in the air curtain device 115 provided in this application, the first air outlet 11522 of the air curtain fan 1151 is directly connected to the second air inlet 11511 of the air curtain duct 1152, reducing the path of the airflow and eliminating the need for additional connecting pipes or fixing devices, thus simplifying the structure of the air curtain device 115 and reducing its space requirements.

[0060] like Figures 1-3 As shown, in this embodiment, the range hood 100 is a side-draft range hood. Therefore, compared to range hoods with other cavity structures, such as European-style range hoods, the smoke inlet 1111 of the range hood 100 provided in this application is closer to the cooking countertop, so that the fumes below can be directly sucked in by the smoke inlet 1111. The air curtain device 115 is disposed in the second cavity 113, so that the fumes that are not sucked in in time can be carried to the smoke inlet 1111 by the air curtain device 115 during the rising process, and then sucked in and discharged by the range hood 100.

[0061] See Figure 3 and Figure 5 , Figure 5 This is a side cross-sectional view of an air curtain duct provided in some embodiments of this application. In some embodiments, at least a portion of the outer surface 11321 of the lower wall 1132 is located between the first air outlet 11522 and the smoke extraction hole 1111 in the horizontal direction. That is, there is a certain horizontal distance between the first air outlet 11522 and the smoke extraction hole 1111, which allows the air curtain airflow to guide the oil fumes outside the front end of the smoke extraction hole 1111.

[0062] Furthermore, the end of the first air outlet 11522 is flush with or above the outer surface 11321 of the lower wall 1132 of the second cavity 113. This allows the air curtain duct 1152 to be hidden in the second cavity 113, thereby improving the aesthetics of the range hood 100.

[0063] In some embodiments, the outer surface 11321 of the lower wall 1132 of the second cavity 113 can be horizontally arranged, and the end of the first air outlet 11522 is at the same horizontal plane as the outer surface 11321 of the lower wall 1132, or the end of the first air outlet 11522 is located above the outer surface 11321 of the lower wall 1132.

[0064] In some embodiments, the outer surface 11321 of the lower wall 1132 of the second cavity 113 can also be inclined, as long as the end of the first air outlet 11522 is flush with the outer surface 11321 of the lower wall 1132 or the end of the first air outlet 11522 is inside the second cavity 113.

[0065] In some embodiments, the air curtain duct 1152 further includes an upper cover plate 11523 and a lower cover plate 11524. The upper cover plate 11523 is disposed on the side of the air curtain duct 1152 away from the smoke inlet 1111, and a second wall portion 012 is disposed on the upper cover plate 11523 near the first air outlet 11522. The lower cover plate 11524 is disposed on the side of the air curtain duct 1152 near the smoke inlet 1111, and the first wall portion 011 is disposed on the lower cover plate 11524 near the first air outlet 11522. The first wall portion 011 and the second wall portion 012 together form the inner wall surface 01 of the first air outlet 11522. The upper cover plate 11523 and the lower cover plate 11524 form an airflow cavity 02 of the air curtain duct 1152, and the airflow cavity 02 communicates with the first air inlet 11521.

[0066] In other embodiments, the air curtain duct 1152 may be integrally formed. In some embodiments, in order to make the airflow in the air curtain duct 1152 smoother, the upper cover plate 11523 and the lower cover plate 11524 are configured with an arc shape near the first air outlet 11522.

[0067] In some embodiments, the inner wall surface 01 of the air curtain duct 1152 at one end of the first air outlet 11522 is set at an acute angle to the outer surface 11321 of the lower wall 1132. This allows the airflow ejected from the air curtain duct 1152 to be directed toward the smoke inlet 1111 when the air curtain duct 1152 is hidden in the second cavity 113, thereby alleviating oil fume leakage, improving smoke extraction efficiency, and enhancing the aesthetics of the range hood 100.

[0068] In some embodiments, the inner wall surface 01 of the first air outlet 11522 includes a first wall portion 011 and a second wall portion 012, with the first wall portion 011 being closer to the smoke hole 1111 than the second wall portion 012. The first included angle β between the first tangent a of the first wall portion 011 facing outward at the first air outlet 11522 and the outer surface 11321 of the lower wall 1132 ranges from 0 to 45°, for example, 15°, 20°, 25°, 30°, 40°, 45°, etc.; the second included angle α between the second tangent b of the second wall portion 012 facing outward at the first air outlet 11522 and the outer surface 11321 of the lower wall 1132 ranges from 0 to 70°, for example, 30°, 34°, 40°, 50°, 60°, 70°, etc. This allows the airflow emitted from the first air outlet 11522 of the air curtain device 115 to be directed towards the smoke extraction hole 1111, thereby promptly carrying the rising fumes to the smoke extraction hole 1111. In some embodiments, the third included angle θ between the first tangent a and the second tangent b ranges from 0 to 20°, such as 0°, 5°, 10°, 15°, 18°, 20°, etc. This further improves the problem of excessive diffusion of the airflow emitted from the first air outlet 11522, which affects the extraction effect.

[0069] See Figures 1-3 and Figure 8 , Figure 8 This is a schematic diagram of the structure of a condenser plate provided in some embodiments of this application. In some embodiments, the range hood 100 further includes a condenser plate 130, which is disposed outside the front end of the first cavity 112, that is, on the side of the smoke collection plate 111 away from the first cavity 112, so that the condenser plate 130 covers the smoke extraction hole 1111, thereby further improving the aesthetics of the range hood and also allowing at least some of the oil fumes to condense on the condenser plate 130. See also Figure 1 The condenser plate 130 is mounted on the smoke collection plate 111 via the mounting assembly 133.

[0070] In some embodiments, the condenser plate 130 can be fixedly installed on the smoke collecting plate 111. In other embodiments, the condenser plate 130 can also rotate relative to the smoke collecting plate 111. Meanwhile, depending on different usage scenarios, the condenser plate 130 can be set to be parallel to the smoke collecting plate 111, or the condenser plate 130 can be set to be at a certain angle to the smoke collecting plate 111.

[0071] See Figure 3 In some embodiments, to prevent the condenser plate 130 from blocking the smoke extraction hole 1111 and causing a decrease in the smoke extraction capacity of the range hood 100, the distance between the condenser plate 130 and the smoke collection plate 111 is set to be greater than 40mm, such as 45mm, 48mm, 52mm, etc. Preferably, the distance between the condenser plate 130 and the smoke collection plate 111 is not less than 50mm, such as 50mm, 55mm, 60mm, 65mm, etc.

[0072] See also Figure 3 and Figure 8 The condenser plate 130 includes a plurality of upper smoke inlets 131 and a plurality of lower smoke inlets 132. In some embodiments, when the smoke inlet 1111 of the range hood 100 is covered by the condenser plate 130, a first air outlet 11522 is provided to face the upper smoke inlet 131 or the upper part of the condenser plate 130 (between the top of the condenser plate 130 and the outer surface 11321 of the lower wall 1132). That is, the airflow from the air curtain device 115 needs to face the upper smoke inlet 131 or the upper part of the condenser plate 130, so that the rising fumes are guided to the smoke inlet 1111 by the air curtain airflow.

[0073] like Figure 3 As shown, the upper smoke inlet 131 is located near the lower wall 1132, therefore, the airflow from the air curtain device 115 needs to be ejected horizontally along the outer surface 11321 of the lower wall 1132. In some embodiments, when the range hood 100 is equipped with a condenser plate 130, the range of the first included angle β is 0-30°, such as 20°, 25°, 30°, etc.; the range of the second included angle α is 0-60°, such as 40°, 50°, 55°, etc.; further, the range of the third included angle θ is 0-15°, such as 5°, 8°, 12°, etc. This ensures that the airflow from the air curtain device 115 is ejected horizontally along the outer surface 11321 of the lower wall 1132 and the airflow is concentrated, thereby improving the smoke extraction efficiency when the range hood 100 is equipped with a condenser plate 130. In some embodiments, based on the smoke extraction effect of multiple actual cooking tests, the first included angle β and the second included angle α can both be set to less than 20°, thereby further improving the auxiliary smoke-gathering effect of the air curtain airflow. In other embodiments, the first included angle β, the second included angle α, and the third included angle θ can also be set to other angles according to different cavity structures of the range hood 100, as long as the air curtain airflow emitted from the first air outlet 11522 can guide the fumes to the smoke extraction hole 1111. See also Figure 15 , Figure 15 This paper presents simulations of the airflow emitted by the air curtain device when the first included angle β is fixed at 60° and the second included angle is set to different angles, according to some embodiments of the range hood provided in this application. The simulation results show that when the first included angle β is fixed at 60°, regardless of how the second included angle α is set, the airflow emitted by the air curtain device 115 is non-horizontal and divergent. See also... Figure 16 , Figure 16 This paper presents simulations of the airflow emitted by the air curtain device when the second included angle is fixed at 60° and the first included angle is set to different angles, according to some embodiments of the range hood provided in this application. The simulation results show that when the second included angle α is fixed at 60° and the first included angle β is set to 0° to 30°, the airflow emitted by the air curtain device 115 is horizontal and concentrated. Figure 17This paper presents simulations of the airflow emitted by the air curtain device when the first included angle is fixed at 30° and the second included angle is set to different angles in some embodiments of the range hood provided in this application. According to the simulation results, when the first included angle β is fixed at 30° and the second included angle α is set to 30° to 75°, the airflow emitted by the air curtain device 115 is horizontal and concentrated, and when the second included angle α is set to less than or equal to 60°, the air curtain airflow has the best effect of adhering to the outer surface 11321 of the lower wall 1132.

[0074] See also Figure 5 In some embodiments, to facilitate the connection between the first air inlet 11521 and the second air outlet 11512, and to reduce the space occupied by the air curtain device 115, the axis of the first air inlet 11521 is set to be horizontal. This allows the airflow ejected from the second air outlet 11512 to directly enter the air curtain duct 1152, improving the efficiency of the airflow. Further, in some embodiments, the air curtain duct 1152 includes an air inlet section 11525, a first air guide section 11526, and a second air guide section 11527. The air inlet section 11525 has a first air inlet 11521 at one end facing away from the first air guide section 11526. The air inlet section 11525 is used to guide the airflow flowing in from the first air inlet 11521 horizontally to the first air guide section 11526. The first air guide section 11526 is connected to the air inlet section 11525 and the second air guide section 11527 at both ends, respectively, to guide the airflow in the air inlet section 11525 from the horizontal direction to the vertical downward direction, thereby guiding the airflow to the second air guide section 11527. The second air guide section 11527 has a first air outlet 11522 at its end opposite to the first air guide section 11526. The second air guide section 11527 guides the vertically downward airflow in the first air guide section 11526 to turn towards the smoke inlet 1111 or the upper smoke inlet 131. This achieves the turning of the airflow in the air curtain duct 1152. Simultaneously, the air curtain duct 1152, composed of three sections, reduces its height and further reduces the space occupied by the air curtain device 115, allowing for a reduction in the height of the second cavity 113, thus increasing the user's usable space and improving user comfort. In other embodiments, the air curtain duct 1152 may be configured with other structures depending on the different structures of the range hood 100.

[0075] See Figure 5 and Figure 6 , Figure 6This is a bottom view schematic diagram of a single-sided air curtain duct provided for some embodiments of this application. In some embodiments, to improve the pressurization effect of the air curtain duct 1152 and the velocity of the air curtain airflow ejected from the first air outlet 11522, the thickness of the air curtain duct 1152 (i.e., the farthest distance between the upper cover plate 11523 and the lower cover plate 11524) gradually decreases in the direction from the first air inlet 11521 to the first air outlet 11522. The thickness of the air curtain duct 1152 at the first air inlet 11521 is adapted to the size of the second air outlet 11512, and the thickness of the air curtain duct 1152 at the first air outlet 11522, i.e., the minimum thickness of the air curtain duct 1152, is 2mm-8mm, for example, 2mm, 3mm, 5mm, 7mm, 8mm, etc.

[0076] In some embodiments, to improve the structural stability of the air curtain duct 1152 at the first air outlet 11522, the air curtain duct 1152 is provided with at least one support portion 11528 at the first air outlet 11522, and the support portion 11528 is vertically connected to the upper cover plate 11523 and the lower cover plate 11524 at the first air outlet 11522. Figure 6 As shown, in some embodiments, the air curtain duct 1152 is provided with three support parts 11528 evenly at the first air outlet 11522. In other embodiments, the air curtain duct 1152 may also be provided with other numbers of support parts 11528, such as four, five, or six, as long as it does not affect the normal ejection of the air curtain airflow.

[0077] In some embodiments, to improve the uniformity of the airflow from the first air outlet 11522 in the direction perpendicular to the air outlet (the left-right width direction facing the range hood 100 after mounting), and to reduce the size of the air curtain fan 1151 and the air curtain duct 1152, the range hood 100 is provided with two air curtain devices 115 in the second cavity 113. Simultaneously, in the direction perpendicular to the air outlet (the left-right width direction facing the range hood 100 after mounting), the total width of the airflow from the two air curtain devices 115 is greater than or equal to 450mm, for example, 450mm, 470mm, 500mm, 600mm, etc. Preferably, the total width of the airflow from the two air curtain devices 115 is 500mm-850mm, for example, 500mm, 650mm, 700mm, 800mm, 850mm, etc.

[0078] In some embodiments, the length of the first air outlet 11522 of the single-sided air curtain device 115, that is, the width of the first air outlet 11522 in the direction perpendicular to the air outlet (the left-right width direction facing the range hood 100 after mounting), is 180mm-450mm, for example, 180mm, 200mm, 300mm, 400mm, 450mm, etc. Preferably, the width of the first air outlet 11522 in the direction perpendicular to the air outlet is 200mm-370mm, for example, 200mm, 250mm, 300mm, 350mm, 370mm, etc. In some embodiments, to further improve the uniformity of the airflow emitted from the air curtain duct 1152 in the direction perpendicular to the air outlet (the left-right width direction facing the range hood 100 after mounting), the length of the air curtain duct 1152 in the air inlet direction can be extended according to the specific structure of the range hood 100.

[0079] See Figure 5 In some embodiments, to facilitate the installation of the air curtain duct 1152 on the range hood 100, the air curtain duct 1152 is further provided with an installation part 11529, which is located on the side of the lower cover plate 11524 away from the upper cover plate 11523. For example... Figure 6 As shown, in some embodiments, multiple mounting portions 11529 are respectively provided corresponding to multiple support portions 11528. In other embodiments, the mounting portions 11529 may be provided at other positions of the air curtain duct 1152, depending on the different structures of the range hood 100 and the location of the air curtain duct 1152.

[0080] See Figure 7 , Figure 7 This is a cross-sectional schematic diagram of a portion of the structure of a range hood provided in Embodiment 1 of this application. Two air curtain devices 115 of the range hood 100 are symmetrically arranged on both sides of the housing 110 relative to the exhaust chamber 120. In some embodiments, the upper wall 1131 has a plurality of second air inlets 11311 corresponding to the position of the second air inlet 11511, and the arrangement range of the plurality of second air inlets 11311 is adapted to the air outlet area of ​​the second air inlet 11511, so that the second air inlet 11511 communicates with the outside of the range hood 100. Figure 7As shown, in this embodiment, to increase the air intake volume of the air curtain fan 1151 at the second air inlet 11511 and to improve the aesthetics of the range hood 100, the second air inlet 11311 is shaped as a regular hexagon. In other embodiments, the second air inlet 11311 can also be shaped according to different needs. Furthermore, to improve the suction efficiency of the air curtain fan 1151 at the second air inlet 11511, the range hood 100 also includes a sealing gasket 116. The sealing gasket 116 is disposed between the upper wall 1131 and the air curtain fan 1151, and surrounds the second air inlet 11511 and the plurality of second air inlets 11311. See also... Figure 1 In some embodiments, the lower wall 1132 is provided with an air outlet 11322 at the position corresponding to the first air outlet 11522. The shape and size of the air outlet 11322 are adapted to the shape and size of the first air outlet 11522 so that the first air outlet 11522 is connected to the outside of the range hood 100.

[0081] See Figure 2 In some embodiments, the range hood 100 further includes an electronic control module 140 and a check valve 150. The electronic control module 140 is located on the side of the exhaust chamber 120 away from the housing 110, and is electrically connected to both the main fan 121 and the air curtain fan 1151 to control the operation of the range hood 100. The check valve 150 is connected to the main air outlet 1212 of the main fan 121. Furthermore, to improve the aesthetics of the range hood 100, it also includes a decorative cover 160, which surrounds the sides of the front cover 124 and the frame 123. See also... Figures 1-3 In some embodiments, the housing 110 also includes an oil cup 117, which is located on the side of the smoke collecting plate 111 away from the lower wall 1132, and is used to collect the oil condensed at the oil mesh 1112 or the condensing plate 130 to prevent the oil from dripping into the pot or the stove.

[0082] Implementation Method Two:

[0083] The air curtain device 115 provided in Embodiment 1 of this application draws air from the second air inlet 11311 on the upper wall 1131 of the housing 110. When the user installs wall cabinets on both sides of the exhaust chamber 120, the second air inlet 11311 is easily blocked by the wall cabinets, affecting the air intake of the air curtain device 115 and thus preventing sufficient airflow from being ejected, reducing the auxiliary smoke extraction effect of the air curtain device 115. Therefore, this application also provides a range hood 200, see [link to relevant documentation]. Figure 9 and Figure 10 , Figure 9 This is a three-dimensional structural diagram of the range hood provided in Embodiment 2 of this application; Figure 10This is a partial structural diagram of the range hood provided in Embodiment 2 of this application. The range hood 200 also includes a housing 210 and a smoke exhaust chamber 220. The housing 210 includes side walls 219, which are disposed on both sides of the housing 210. The side walls 219 include a first sub-side wall 2191 and a second sub-side wall 2192. The first sub-side wall 2191 is vertically connected to the upper wall 2131 and the lower wall 2132 of the housing 210, thereby forming a second cavity 213. The second sub-side wall 2192 is connected to the smoke collection plate 211 of the housing 210. An air curtain device 215 is disposed in the second cavity 213 formed by the upper wall 2131, the lower wall 2132, and the first sub-side wall 2191. The air curtain device 215 is also composed of an air curtain fan 2151 and an air curtain duct 2152. The structure of the air curtain device 215 provided in Embodiment 2 of this application is the same as that of the air curtain device 115 provided in Embodiment 1, and will not be described here. In some embodiments, the first sub-side wall 2191 is provided with a plurality of first air inlets 21911, which are arranged opposite to the second air inlet 21511. This allows the second air inlet 21511 of the air curtain device 215 to communicate with the outside of the range hood 200, that is, the air curtain device 215 takes in air from the side of the top of the housing 210, avoiding the blockage of the first air inlets 21911 when the user installs cabinets or other devices on both sides of the exhaust chamber 220, so that the air curtain device 215 cannot eject enough airflow and reduce the auxiliary smoke extraction effect of the air curtain device 215.

[0084] See also Figure 9 and Figure 10In some embodiments, to increase the air intake of the air curtain device 215, a plurality of first air inlets 21911 are provided as a plurality of elongated air holes arranged in parallel; in other embodiments, the first air inlets 21911 may also be provided in other shapes. In some embodiments, to further increase the air intake of the air curtain device 215, the total area of ​​the plurality of first air inlets 21911 is provided to be greater than 0.5 times the area of ​​the second air inlet 21511 of the air curtain fan 2151, for example, 0.7 times, 1 times, 1.5 times, etc. Preferably, the total area of ​​the plurality of first air inlets 21911 is provided to be greater than 0.7 times the area of ​​the second air inlet 21511 of the air curtain fan 2151, for example, 1.2 times, 1.7 times, 1.8 times, etc. In some embodiments, to prevent the first air inlet 21911 from being blocked by the air curtain fan 2151, and to reduce the resistance of the air curtain fan 2151 in drawing air from the outside of the range hood 200, the distance between the first sub-sidewall 2191 and the side of the air curtain fan 2151 closest to the first sub-sidewall 2191 is set to be greater than 6mm, for example, 8mm, 1mm, 1.2mm, etc. Preferably, the distance between the first sub-sidewall 2191 and the side of the air curtain fan 2151 closest to the first sub-sidewall 2191 is set to be greater than 8mm, for example, 9mm, 1.5mm, 1.8mm, etc. Further, to prevent the second air inlet 21511 of the air curtain fan 2151 from being blocked by the upper wall 2131, the distance between the second air inlet 21511 and the upper wall 2131 is set to be not less than 6mm, for example, 8mm, 1mm, 1.2mm, etc.

[0085] See Figure 10The housing 210 is provided with a front side plate 2193, which is located on the front side of the second cavity 213 and is connected to the upper wall 2131 and the lower wall 2132 respectively. In some embodiments, in order to improve the air suction efficiency of the air curtain fan 2151 at the second air inlet 21511, the housing 210 further includes an isolation section 217, which includes a first isolation plate 2171 and a second isolation plate 2172. The first isolation plate 2171 is located on the side of the air curtain fan 2151 away from the front side plate 2193 and is connected to the first sub-side wall 2191. The second isolation plate 2172 is located on the side of the air curtain fan 2151 away from the first sub-side wall 2191 and is connected to the front side plate 2193. Therefore, the air curtain fan 2151 is positioned within the space formed by the upper wall 2131, lower wall 2132, front side panel 2193, and isolation section 217, isolating the air curtain fan 2151 from the internal space of the range hood 200. This ensures that the air curtain fan 2151 can only draw in air from the external space and will not draw in air containing a large amount of oil fumes from inside the range hood 200, thus preventing the air curtain device 215 from being contaminated by oil fumes and reducing its service life. At the same time, the isolation section 217 helps to redirect the airflow entering from the side of the range hood 200 from the horizontal direction to the vertical direction, improving the air intake efficiency of the air curtain fan 2151 in the simplest way without changing the shape of the air curtain fan 2151 or other structures of the range hood 200. Meanwhile, the isolation section 217 can create negative pressure in the space formed by the upper wall 2131, lower wall 2132, front side panel 2193, and isolation section 217 to assist the air curtain device 215 in generating airflow, further improving the auxiliary smoke extraction effect of the air curtain device 215. Furthermore, the air curtain fan 2151 is disposed in the space formed by the upper wall 2131, lower wall 2132, front side panel 2193, and isolation section 217, isolating the air curtain fan 2151 from the internal space of the range hood 200. This ensures that the air curtain fan 2151 can only draw in air from the external space and will not draw in air containing a large amount of oil fumes from inside the range hood 200, thereby preventing the air curtain device 215 from being contaminated by oil fumes and also preventing the external air of the range hood 200 from being contaminated by oil fumes.

[0086] The exhaust chamber 220, condenser plate 230, and other structures of the range hood 200 provided in Embodiment 2 of this application are the same as the corresponding structures of the range hood 100 provided in Embodiment 1, and will not be described again here.

[0087] Implementation Method 3:

[0088] See Figure 11 and Figure 12 , Figure 11 A three-dimensional structural diagram of a portion of the range hood provided in Embodiment 3 of this application; Figure 12This is a cross-sectional structural view of a range hood provided in Embodiment 3 of this application. Embodiment 3 of this application provides a range hood 300, which also includes a housing 310 and a smoke exhaust chamber 320. The housing 310 has a smoke collection plate 311 with a smoke extraction hole 3111. The smoke exhaust chamber 320 includes a first back plate 322, a frame 323, and a front cover 324. A decorative cover 360 is disposed around the side of the front cover 324 and the frame 323, and a certain distance is provided between the decorative cover 360 and the front cover 324 so that the decorative cover 360 and the front cover 324 form an air curtain cavity 316. A portion of the air curtain device 315 is disposed outside the side wall of the smoke exhaust chamber 320 facing the same side as the smoke extraction hole 3111, that is, a portion of the air curtain device 315 is disposed within the air curtain cavity 316 formed by the front cover 324 and the decorative cover 360. Therefore, the air curtain device 315 can draw air from the top of the range hood 300, which means that there is no need to set the corresponding air inlet of the air curtain device 315 on the outer surface of the range hood 300, which can improve the aesthetics of the range hood 300.

[0089] See also Figure 11 and Figure 12The air curtain device 315 includes an air curtain fan 3151 and an air curtain duct 3152. The air curtain fan 3151 is disposed in the air curtain cavity 316, that is, the air curtain fan 3151 is located outside the housing 310, thereby allowing the air curtain device 315 to draw air from the top of the decorative cover 360 and the exhaust cavity 320 of the range hood 300. The air curtain fan 3151 includes a second air inlet 31511 and a second air outlet 31512, with the second air inlet 31511 facing the decorative cover 360. In some embodiments, to prevent the second air inlet 31511 from being blocked by the decorative cover 360, thereby affecting the airflow emitted by the air curtain device 315, the distance between the second air inlet 31511 and the decorative cover 360 is set to be greater than or equal to 8mm, such as 8mm, 10mm, 12mm, 15mm, etc. Preferably, the distance between the second air inlet 31511 and the decorative cover 360 is greater than or equal to 10mm, such as 10mm, 18mm, 20mm, 22mm, etc. In some embodiments, the range hood 300 includes two air curtain devices 315, which are symmetrically arranged on the front side of the range hood 300 in the vertical direction (vertical direction) of the air inlet direction of the second air inlet 31511. Part of the air curtain duct 3152 is disposed in the air curtain cavity 316, and the other part of the air curtain duct 3152 is disposed in the second cavity 313 of the housing 310. The air curtain duct 3152 includes a first air inlet 31521 and a first air outlet 31522, and the first air inlet 31521 is directly connected to the second air outlet 31512 in the vertical direction. The width of the air curtain duct 3152 provided in Embodiment 3 of this application in the vertical direction of the first air outlet 31522 is the same as that of the air curtain duct 1152 provided in Embodiment 1, and will not be described here. In some embodiments, in order to facilitate the guidance of the airflow entering the air curtain fan 3151 and to fill the entire air curtain duct 3152 along the left and right width direction of the range hood 300, and at the same time to improve the uniformity of the air curtain airflow ejected from the air curtain duct 3152 along the left and right width direction of the range hood 300, the thickness of the air curtain duct 3152 is set to gradually increase along the direction from the first air inlet 31521 to the first air outlet 31522. In some embodiments, the decorative cover 360 is provided with an air inlet hole (not shown in the figure) at the position corresponding to the second air inlet 31511 to improve the air intake efficiency of the air curtain fan 3151.

[0090] See Figure 13 , Figure 13This is a front view schematic diagram of a single-sided air curtain duct provided in Embodiment 3 of this application. In some embodiments, to facilitate the connection and communication between the first air inlet 31521 and the second air outlet 31512, the first air inlet 31521 is arranged vertically along its axis. This also allows the airflow in the air curtain duct 3152 to not need to turn, improving the efficiency of airflow discharge. Further, in some embodiments, the air curtain duct 3152 includes an air inlet 31525 and an air outlet 31527. The air inlet 31525 is connected to the second air outlet 31512 through the first air inlet 31521, and the air inlet 31525 is disposed in the air curtain cavity 316. The air outlet 31527 is located in the second cavity 313, and the air outlet 31527 is disposed on the side of the air inlet 31525 away from the first air inlet 31521. In the vertical direction of the air inlet 31511, that is, in the vertical direction, the height of the outlet 31527 is adapted to the distance between the upper wall 3131 and the lower wall 3132 of the housing 310. In some embodiments, to reduce the loss of airflow entering from the air curtain fan 3151 within the air curtain duct 3152, the total height of the air curtain duct 3152 is set to be greater than 3 times, for example 3.5 times, 4 times, or 4.5 times, the height of the outlet 31527 in the vertical direction. In some embodiments, to facilitate airflow pressurization within the air curtain duct 3152, the height of the outlet 31527 is set to be greater than 25 mm, for example 28 mm, 30 mm, or 35 mm. Preferably, the height of the outlet 31527 is set to be greater than 30 mm, for example 32 mm, 37 mm, or 40 mm.

[0091] See Figure 14 , Figure 14 This is a side cross-sectional view of the air curtain duct provided in Embodiment 3 of this application. In some embodiments, the air curtain duct 3152 is formed by an upper cover plate 31523 and a lower cover plate 31524. The angle of the first wall portion 031 of the upper cover plate 31523 and the second wall portion 032 of the lower cover plate 31524 at the first air outlet 31522 of the air curtain duct 3152 provided in Embodiment 3 is the same as that of the air curtain duct 1152 provided in Embodiment 1, and will not be described here. At the same time, the other structures of the range hood 300 provided in Embodiment 3, such as the housing 310, the exhaust chamber 320, and the condenser plate 330, are the same as the corresponding structures of the range hood 100 provided in Embodiment 1, and will not be described here.

[0092] This application provides an air curtain device 115 and a range hood 100. The range hood 100 includes a housing 110 and an air curtain device 115 disposed within the housing 110. The housing 110 has a first cavity 112 and a second cavity 113 located above the first cavity 112. The air curtain device 115 includes an air curtain duct 1152 disposed within the second cavity 113 and having a first air outlet 11522. The first air outlet 11522 is used to communicate with the external space of the range hood 100 and is directed toward the smoke hole 1111 of the first cavity 112. The end of the air curtain duct 1152 with the first air outlet 11522 is flush with or above the outer surface 11321 of the lower wall 1132 of the second cavity 113. This allows rising and potentially leaking fumes to be carried by the airflow of the air curtain to the smoke inlet 1111, where they are then sucked away and exhausted by the range hood 100, thus mitigating fume escape and improving smoke extraction efficiency. Simultaneously, the air curtain duct 1152 can be concealed within the second cavity 113 while assisting in smoke extraction, enhancing the aesthetics of the range hood.

[0093] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An air curtain device, characterized in that, For use in a range hood, the range hood includes a housing and an air curtain device disposed within the housing, the housing having a first cavity and a second cavity located above the first cavity, the air curtain device comprising: An air curtain duct is provided in the second cavity and has a first air outlet. The first air outlet is used to communicate with the external space of the range hood and is directed toward the smoke hole of the first cavity. The end of the air curtain duct with the first air outlet is flush with or above the outer surface of the lower wall of the second cavity.

2. The air curtain device according to claim 1, characterized in that, Along the horizontal direction, at least a portion of the outer surface of the lower wall is located between the first air outlet and the smoke extraction hole, and the tangential direction of the inner wall surface of the first air outlet is set at an acute angle to the at least a portion of the area.

3. The air curtain device according to claim 2, characterized in that, The inner wall surface of the first air outlet includes a first wall portion and a second wall portion, wherein the first wall portion is closer to the smoke inlet than the second wall portion; The first angle between the first tangent line of the first wall portion facing outward at the first air outlet and the at least part of the region is 0-45°, and the second angle between the second tangent line of the second wall portion facing outward at the first air outlet and the at least part of the region is 0-70°.

4. The air curtain device according to claim 3, characterized in that, The third included angle between the first tangent and the second tangent is 0-20°.

5. The air curtain device according to claim 3, characterized in that, The air curtain duct further includes: An upper cover plate is disposed on the side of the air curtain duct away from the smoke inlet, and the second wall portion is disposed on the upper cover plate; The lower cover plate is disposed on the side of the air curtain duct near the smoke inlet, and the first wall portion is disposed on the lower cover plate; The upper cover plate and the lower cover plate enclose an airflow cavity that forms the air curtain duct, and the airflow cavity is connected to the first air outlet.

6. The air curtain device according to claim 1, characterized in that, The end of the first air outlet is located in the horizontal plane.

7. The air curtain device according to claim 6, characterized in that, The air curtain duct includes a first air inlet, which is horizontally arranged axially.

8. The air curtain device according to claim 7, characterized in that, The air curtain duct includes an air inlet section, a first air guide section, and a second air guide section connected in sequence. The air inlet section is provided at one end away from the first air guide section, and the air inlet section is used to guide the airflow flowing in from the first air inlet to the first air guide section in a horizontal direction. The first air guide section is used to guide the airflow in the air intake section from the horizontal direction to the vertical downward direction; The second air guide section has the first air outlet at one end away from the first air guide section. The second air guide section is used to guide the vertically downward airflow in the first air guide section to turn towards the smoke hole.

9. The air curtain device according to claim 6, characterized in that, The air curtain duct includes a first air inlet, which is vertically oriented axially.

10. The air curtain device according to claim 7 or 9, characterized in that, Also includes: The air curtain fan includes a second air inlet and a second air outlet, wherein the second air inlet is connected to the external space of the range hood; The first air inlet is connected to the second air outlet.

11. The air curtain device according to claim 5, characterized in that, The air curtain duct also includes: At least one support is provided at the first air outlet and is vertically connected to the upper cover plate and the lower cover plate.

12. A range hood, characterized in that, include: The housing includes a first cavity and a second cavity located above the first cavity, wherein the smoke extraction hole of the range hood is disposed in the first cavity; The air curtain device according to any one of claims 1 to 11; The end of the air curtain duct with the first air outlet is flush with or above the outer surface of the lower wall of the second cavity.

13. The range hood according to claim 12, characterized in that, The air curtain device also includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located in the second cavity, and the air curtain duct includes a first air inlet, which is horizontally arranged in the axial direction; the first air inlet is connected to the second air outlet. The second cavity also includes a first sub-sidewall, which is provided with a first air inlet, and the first air inlet is disposed opposite to the second air inlet.

14. The range hood according to claim 12, characterized in that, The air curtain device also includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located in the second cavity, and the air curtain duct includes a first air inlet, which is horizontally arranged in the axial direction; the first air inlet is connected to the second air outlet. The second cavity also includes an upper wall, which is provided with a second air inlet, which is positioned opposite to the second air inlet.

15. The range hood according to claim 12, characterized in that, The air curtain device also includes an air curtain fan, which is provided with a second air inlet and a second air outlet. The second air inlet is connected to the external environment of the range hood. The air curtain fan is located outside the housing, and the air curtain duct includes a first air inlet, which is vertically oriented; the first air inlet is connected to the second air outlet.

16. The range hood according to claim 12, characterized in that, Also includes: A condenser plate is disposed outside the front end of the first cavity and covers the smoke inlet; The condenser plate is provided with an upper smoke inlet at one end near the second cavity, and the first air outlet is directed toward the upper smoke inlet.

17. The range hood according to claim 12, characterized in that, The projected area of ​​the smoking hole in the horizontal plane is greater than or equal to 1 / 4 of the projected area of ​​the first cavity in the horizontal plane.

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